Calculating the Area of the Living Room Floor

Oct 13, 2025 by windailys.com 31 views

Introduction

In this problem, we are tasked with finding the area of the living room floor that will remain uncarpeted after Ms. Brown installs a quarter-circle carpet. To do this, we need to calculate the area of the quarter-circle and subtract it from the total area of the living room floor.

The Problem

Ms. Brown plans to carpet a quarter-circle in her 20 feet by 20 feet living room floor. The quarter-circle will be centered at the corner of the room, and its radius will be equal to the length of the room, which is 20 feet.

Calculating the Area of the Quarter-Circle

To calculate the area of the quarter-circle, we can use the formula for the area of a circle, which is A = πr^2, where A is the area and r is the radius. Since we are dealing with a quarter-circle, we need to divide the area of the circle by 4 to get the area of the quarter-circle.

A_{quarter-circle} = \frac{1}{4} \pi r^2

In this case, the radius of the quarter-circle is 20 feet, so we can plug this value into the formula to get:

A_{quarter-circle} = \frac{1}{4} \pi (20)^2

Simplifying the expression, we get:

A_{quarter-circle} = \frac{1}{4} \pi (400)

A_{quarter-circle} = 100\pi

Calculating the Area of the Living Room Floor

The living room floor is a square with sides of length 20 feet. To calculate the area of the square, we can use the formula A = s^2, where A is the area and s is the length of the side.

A_{square} = s^2

In this case, the length of the side is 20 feet, so we can plug this value into the formula to get:

A_{square} = (20)^2

Simplifying the expression, we get:

A_{square} = 400

Finding the Uncovered Area

To find the area of the living room floor that will remain uncarpeted, we need to subtract the area of the quarter-circle from the area of the square.

A_{uncarpeted} = A_{square} - A_{quarter-circle}

Plugging in the values we calculated earlier, we get:

A_{uncarpeted} = 400 - 100\pi

Using a calculator to evaluate the expression, we get:

A_{uncarpeted} \approx 400 - 314.16

Simplifying the expression, we get:

A_{uncarpeted} \approx 85.84

Conclusion

In this problem, we calculated the area of the quarter-circle and the area of the living room floor, and then subtracted the area of the quarter-circle from the area of the square to find the area of the living room floor that will remain uncarpeted. We found that approximately 85.84 square feet of the living room floor will remain uncarpeted.

Final Answer

$The final answer is: $\boxed{86}$<br/> **11. Ms. Brown's Carpet Conundrum: Finding the Uncovered Area - Q&A**$

Introduction

In our previous article, we explored the problem of finding the area of the living room floor that will remain uncarpeted after Ms. Brown installs a quarter-circle carpet. In this article, we will answer some of the most frequently asked questions related to this problem.

Q: What is the formula for the area of a quarter-circle?

A: The formula for the area of a quarter-circle is A = (1/4)πr^2, where A is the area and r is the radius.

Q: How do I calculate the area of the quarter-circle in this problem?

A: To calculate the area of the quarter-circle, you need to plug in the value of the radius (20 feet) into the formula A = (1/4)πr^2. This will give you the area of the quarter-circle, which is approximately 100π square feet.

Q: What is the formula for the area of a square?

A: The formula for the area of a square is A = s^2, where A is the area and s is the length of the side.

Q: How do I calculate the area of the living room floor in this problem?

A: To calculate the area of the living room floor, you need to plug in the value of the side length (20 feet) into the formula A = s^2. This will give you the area of the square, which is 400 square feet.

Q: How do I find the area of the living room floor that will remain uncarpeted?

A: To find the area of the living room floor that will remain uncarpeted, you need to subtract the area of the quarter-circle from the area of the square. This will give you the area of the living room floor that will remain uncarpeted, which is approximately 85.84 square feet.

Q: Why is the area of the living room floor that will remain uncarpeted not exactly 86 square feet?

A: The area of the living room floor that will remain uncarpeted is not exactly 86 square feet because the value of π is an irrational number, which means it cannot be expressed as a finite decimal or fraction. When we calculate the area of the quarter-circle, we use an approximation of π, which is 3.14. This means that the area of the quarter-circle is approximately 100(3.14) = 314.16 square feet. When we subtract this value from the area of the square (400 square feet), we get approximately 85.84 square feet.

Q: What is the significance of finding the area of the living room floor that will remain uncarpeted?

A: Finding the area of the living room floor that will remain uncarpeted is important because it helps Ms. Brown plan her carpet installation project. By knowing the area of the living room floor that will remain uncarpeted, she can determine how much carpet she needs to buy and how much she will need to pay for the installation.

Conclusion

In this article, we answered some of the most frequently asked questions related to the problem of finding the area of the living room floor that will remain uncarpeted after Ms. Brown installs a quarter-circle carpet. We hope that this article has been helpful in clarifying any confusion and providing a better understanding of the problem.

Final Answer

The final answer is: $\boxed{86}$